/// <summary>
/// Gets the winning hand.
/// </summary>
/// <param name="hands">The poker hands.</param>
/// <returns>List of winning hands. Is a list since ties are possible. Chopped pots.</returns>
/// <exception cref="ArgumentNullException">hands</exception>
/// <exception cref="ArgumentException">hands</exception>
public List <PokerHandDto> GetWinningHand(List <PokerHandDto> hands)
{
//null check
if (hands == null)
{
throw new ArgumentNullException(nameof(hands));
}
//empty check
if (!hands.Any())
{
throw new ArgumentException(nameof(hands));
}
//first winner to first item in list
List <PokerHandDto> winners = new List <PokerHandDto> {
hands[0]
};
var winnerWinPriority = _handTypes.GetHandTypeByTypeName(winners[0].Type).WinPriority;
for (int i = 1; i < hands.Count(); i++)
{
var currentWinPriority = _handTypes.GetHandTypeByTypeName(hands[i].Type).WinPriority;
if (currentWinPriority < winnerWinPriority)
{
winnerWinPriority = currentWinPriority;
winners = new List <PokerHandDto> {
hands[i]
};
}
else if (currentWinPriority == winnerWinPriority)
{
winners = ResolveWinPriorityTie(winners, hands[i], currentWinPriority);
}
}
return(winners);
}
/// <summary>
/// Gets the type of the hand.
/// </summary>
/// <param name="hand">The hand.</param>
/// <returns>HandType.</returns>
/// <exception cref="ArgumentNullException">Provided poker hand is null.</exception>
public HandType GetHandType(PokerHand hand)
{
//null check
if (hand == null)
{
throw new ArgumentNullException(nameof(hand));
}
List <Card> cardsInHand = GetListOfCardsFromHand(hand);
//check if hand is Straight
bool isHandStraight = IsHandStraight(cardsInHand);
//check if hand is flush
bool isHandFlush = IsHandFlush(cardsInHand);
//check is hand straight flush
if (isHandStraight && isHandFlush)
{
return(_handTypes.GetHandTypeByTypeName("Straight Flush"));
}
//return if flush
if (isHandFlush)
{
return(_handTypes.GetHandTypeByTypeName("Flush"));
}
//return if straight
if (isHandStraight)
{
return(_handTypes.GetHandTypeByTypeName("Straight"));
}
//Get list of card frequencies
List <CardFrequency> repeatedHandRankList = new CardFrequencyList().GetCardFrequencyList(cardsInHand);
//check for quads
var quads = repeatedHandRankList.Where(cr => cr.Frequency == 4).FirstOrDefault();
if (quads != null)
{
return(_handTypes.GetHandTypeByTypeName("Four of a Kind"));
}
//check for full house
var trips = repeatedHandRankList.Where(cr => cr.Frequency == 3).FirstOrDefault();
if (trips != null)
{
//check for full house
var pairNeededForBoat = repeatedHandRankList.Where(cr => cr.Frequency == 2).FirstOrDefault();
if (pairNeededForBoat != null)
{
return(_handTypes.GetHandTypeByTypeName("Full House"));
}
}
//check for trips
if (trips != null)
{
return(_handTypes.GetHandTypeByTypeName("Three of a Kind"));
}
//check for two pair
var pairs = repeatedHandRankList.Where(cr => cr.Frequency == 2);
if (pairs.Any())
{
if (pairs.Count() == 2)
{
return(_handTypes.GetHandTypeByTypeName("Two Pair"));
}
//must be pair
return(_handTypes.GetHandTypeByTypeName("Pair"));
}
//With all other options exausted hand must be a high card
return(_handTypes.GetHandTypeByTypeName("High Card"));
}